2017/07/28 ver 5.1.26

VirtualBox 5.1.26 (released 2017-07-27)
This is a maintenance release. The following items were fixed and/or added:
VMM: reset the TSC on VM reset to work around a Windows bug (bug #16643)
Audio: fixed memory leak when enabled with VRDP connections (5.1.24 regression; bug #16928)
Audio: fixed creation of too many sound sinks on Linux hosts when using the PulseAudio backend (bug #16938)
Audio: implemented record gain registers for AC'97 emulation; those are needed for newer Ubuntu guests which rely on those when controlling gain and muting the recording (capturing) levels
Storage: fixed hang when using the emulated NVMe controller with the SPDK (bug #16945)
Mouse: double click was not working with a precision touchpad (bug #14632)
Linux hosts: properly bring up host-only network interfaces with iproute (5.1.24 regression; bug #16911)
Linux hosts: provide Python 3 libraries for deb/rpm packages
Windows hosts: make it possible to use host-only networking without having bridged networking installed
Windows guests: fixed automatic logons for Vista and newer Windows guests (5.1.24 regression; bug #16921)
API: use the correct file name of the VM machine state if the VM settings directory is renamed, for example during grouping / ungrouping a VM (bugs #16074 and #16745)
Windows hosts: another fix for Windows insider builds (bug #16892)

2017/07/19 ver 5.1.24

Last modified 5 hours ago
VirtualBox 5.1.24 (released 2017-07-18)
This is a maintenance release. The following items were fixed and/or added:
VMM: mask the VME CPUID capability on AMD Ryzen processors for now to make certain guests works, for example Windows XP
VMM: emulate more SSE2 instructions
VMM: properly clear the TF and AC flags when dispatching real-mode interrupts
GUI: fixes to make the mini-toolbar work with recent versions of KDE / Plasma (bug #16325)
GUI: fixed a potential crash when a VM with multiple screens is running in full screen / seamless mode and a host screen is removed, for example when connecting to the host via RDP
GUI: fixed initial size hints for guests which set intermediate sizes before responding (bug #16593)
GUI: prevent stopped screen updates or black screen on reboot in a multi-screen setup under certain conditions
Audio: many improvements for Windows 10 guests (bugs #15189, #15925, #16170, #16682, #16794 and others)
Storage: fixed possible crash when using Intels SPDK
API: use the correct file name of the VM machine state if the VM settings directory is renamed, for example during grouping / ungrouping a VM (bugs #16075 and #16745)
API: return the correct error code if powering up a VM fails
API: video recording did not automatically start at VM start when enabled in the VM settings (bug #16803)
API: when relocating a medium, check that the target path is fully qualified
EFI: fix for VMs with more than 3504MB RAM (bug #11103)
Host-only adapter: correctly determine IPv4 netmasks on Windows hosts (bug #16826)
NAT network: properly do the refcounting for starting / stopping the NAT / DHCP services if the NAT network is changed while the adapter network connection type is anything else but NAT network
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